通过对三维离散元中渗流计算模型，渗流几何模型与力学几何模型的结合等问题研究，提出了三维离散元中渗流计算与力学计算的耦合方法。将该计算方法应用到某地下洞室块体稳定计算中，分析了地下水作用和节理张开度对计算结果的影响。计算结果表明，其结果是符合实际的。

On the basis of researching underground flow calculation model in 3D discrete element method (DEM) and the combination of flow model and solid model etc., the calculation method was presented about the coupling analysis of flow and mechanical calculation. The proposed scheme has been applied to study the blocks stability of some underground tunnel and the influence of the action of underground water and joint apertures on calculated results was analysed. The calculated results accord with practice.